Output of RSS feed should not be parsed as wiki text

[earle]

Looks like leading spaces on lines in RSS output are being interpreted as preformatted text wiki formatting by Text::WikiFormat?.

http://london.openguides.org/index.cgi?South_Bank_Centre

[Kake]

We should do this by changing Wiki::Toolkit::Formatter::UseMod so it accepts "pre_format_macros" and "post_format_macros" as alternative arguments to the current "macros" argument.

[dom]

I think it would be better to have the possibility of macros being passed in as hashrefs, so they can contain hashrefs. Since the RSS macros currently reverses the HTML-escaping performed by the formatter, we should take advantage of this to introduce an option for whether to process the macro before the escaping too. This would mean individually formatting each of the macros separately, to allow for all such combinations.